19
CTK0* T
HERMOSTAT
W
IRING
NOTE:
Refer to section Electrical Connections for 208/230
volt line connections to the air handler
.
NOTE:
A removable plug connector is provided with the
control to make thermostat wire connections. This plug may
be removed, wire connections made to the plug, and replaced.
It is
STRONGLY
recommended that you do not connect
multiple wires into a single terminal. Wire nuts are
recommended to ensure one wire is used for each
terminal.
Failure to do so may result in intermittent operation.
Typical 18 AWG thermostat wire may be used to wire the
system components. One hundred (100) feet is the maxi-
mum length of wire between indoor unit and outdoor unit, or
between indoor unit and thermostat.
F
OUR
-W
IRE
I
NDOOR
AND
O
UTDOOR
W
IRING
Typical wiring will consist of four wires between the indoor
unit and outdoor unit and between the indoor unit and ther-
mostat. The required wires are: (a) data lines, 1 and 2; (b)
thermostat “R” (24 VAC hot) and “C” (24 VAC common).
1
2
R C
1
2
R
C
CTK0*
Thermostat
CT™ Compatible
Air Handler Blower
Integrated Control Module
CT™ Compatible AC/HP
Integrated Control Module
1
2
R C
System Wiring Using Four-Wires
T
WO
-W
IRE
O
UTDOOR
, F
OUR
-W
IRE
I
NDOOR
W
IRING
Two wires only may be utilized between the indoor and out-
door units. For this wiring scheme, only the data lines, 1 and
2, are required between the indoor and outdoor units. A
40VA, 208/230 VAC to 24 VAC transformer must be installed
in the outdoor unit to provide 24 VAC power to the outdoor
unit’s electronic control. See kit instructions for mounting
and wiring instructions. Four wires are required between the
indoor unit and thermostat.
1
2
R C
1
2
R C
CTK0*
Thermostat
CT™ Compatible
Air Handler Blower
Integrated Control
Module
CT™ Compatible
AC/HP Integrated
Control Module
40VA Transformer
208/230 VAC
24 VAC
1
2
R C
System Wiring using Two-Wires between Air Handler and AC/
HP and Four-Wires between Air Handler and Thermostat
C
OMFORT
N
ET
™ S
YSTEM
A
DVANCED
F
EATURES
The ComfortNet system permits access to additional system
information, advanced set-up features, and advanced diag-
nostic/troubleshooting features. These advanced features
are organized into a menu structure. See the AIR HANDLER
ADVANCED FEATURES MENU section for layout of menu
shortcuts.
D
IAGNOSTICS
Accessing the air handler’s diagnostics menu provides ready
access to the last six faults detected by the air handler. Faults
are stored most recent to least recent. Any consecutively
repeated fault is stored a maximum of three times. Example:
A clogged return air filter causes the air handler’s motor to
repeatedly enter a limiting condition. The control will only store
this fault the first three
consecutive
times the fault occurs.
NOTE:
It is highly recommended that the fault history be
cleared after performing maintenance or servicing the air
handler
.
N
ETWORK
TROUBLESHOOTING
The ComfortNet system is a fully communicating system, and
thus, constitutes a network. Occasionally the need to trouble-
shoot the network may arise. The integrated air handler con-
trol has some on-board tools that may be used to trouble-
shoot the network. These tools are: red communications LED,
green receive (Rx) LED, and learn button. Refer
to the
Communications Troubleshooting Chart
at the end of
this manual for error codes, possible causes and corrective
actions
•
Red communications LED – Indicates the status of the
network. The table below indicates the LED status and
the corresponding potential problem.
•
Green receive LED – Indicates network traffic. The
table below indicates the LED status and the corre-
sponding potential problem.
•
Learn button – Used to reset the network. Depress
the button for approximately 2 seconds to reset the
network.
S
YSTEM
T
ROUBLESHOOTING
NOTE:
Refer to the instructions accompanying the
ComfortNet compatible outdoor AC/HP unit for
troubleshooting information.
Refer to the
Troubleshooting Chart
at the end of this manual
for a listing of possible air handler error codes, possible
causes and corrective actions.